Natural Resources Research Articles
Large-area spatial disaggregation of a mosaic of conventional soil maps: evaluation over Western Australia
Document Type
Article
Publication Date
11-2-2015
Journal Title
Soil Research
ISSN
Print: 1838-675X Electronic: 1838-6768
Keywords
digital soil mapping, global digital soil map, legacy soil maps, resampled classification trees, scale, uncertainty, validation
Disciplines
Agriculture | Natural Resources and Conservation
Abstract
Conventional soil maps may be the best available source for spatial soil information in data-limited areas, including individual soil properties. Spatial disaggregation of these maps, or mapping the unmapped soil components, offers potential for transforming them into spatially referenced soil class distributions. We used an automated, iterative classification tree approach to spatially disaggregate a patchwork of soil surveys covering Western Australia (2.5 × 106 km2) to produce raster surfaces of soil class occurrence. The resulting rasters capture the broad spatial patterns of dominant soils and harmonise soil class designations across most survey boundaries. More than 43 000 archived profiles were used to evaluate the accuracy of the rasters. In 20% of cases, the predicted soil class with the highest probability matched that recorded for the profile; when any of the three highest probability soil classes predicted were considered correct, the global accuracy was 40%. The accuracy increased to 71% when the rasters were reassembled to represent a higher level in the soil classification system. The predicted surfaces retained features related to the mapping intensity of the original surveys and generally had higher prediction accuracy of profile soil class where the surface geochemistry was more homogeneous. The best indicator of prediction accuracy was how common the profile soil class was in the original mapping (94% variance explained); profile observations collected during soil survey may be biased towards rare soils, making them less suitable for validation or modelling directly from point data.
Recommended Citation
Holmes K. W., Griffin E. A., Odgers N. P. (2015) Large-area spatial disaggregation of a mosaic of conventional soil maps: evaluation over Western Australia. Soil Research 53, 865-880. https://doi.org/10.1071/SR14270
